59998domain: NAppears in sequencesSum of even composites up to n is palindromic.at n=12A058851Smallest even number with digit sum n.at n=39A069532Least number k such that A070635(k) = n.at n=38A138791Lexicographically earliest sequence of distinct positive terms such that a(n) is a substring of a(n)*a(n+1).at n=54A332703